Hello MM,
create a varible for LIFEX as V_LIFEX
Use Table VBFA and VBTYP_N as J for Delivery and VBTYP_N as M for Invoice
select sales order number using Invoice number and pass sales order number to get the delivery number.
Data : V_LIFEX type LIKP-LIFEX " external identification number
V_VBELN type vbfa-vbeln " sales order
V_VBELV type VBFA-VBELV " delivery number
select single Vbeln from VBFA into V_VBELN where VBELV = invoice number and VBTYP_N = 'M'.
select single vbelv from VBFa into V_VBELV where VBELN = V_VBELN and VBTYP_N = 'J'.
Select single LIFEX from LIKP into V_LIFEX where vbeln = v_vbelv .